FIELD: medicine.
SUBSTANCE: method of preventing damage to an ultrasonic diagnostic sensor of an acoustic unit by high-intensity focused ultrasound radiation reflected upon loss of acoustic contact, wherein the acoustic unit contains a housing, inside which there is a high-intensity focused ultrasound transducer coaxially placed, providing the possibility of electronic dynamic focusing and made in the form of a multi-element two-dimensional ultrasonic phased array with a radiating surface in the form of a concave ring element, and an ultrasonic diagnostic sensor containing a multi-element one-dimensional linear array, the body is filled with an immersion liquid and hermetically sealed with a membrane of an acoustically transparent elastic material, the method is as follows: the possibility of shifting the focus of the focused ultrasound transducer with a high intensity is limited, at the same time, the value of the reference signal is determined, which is the signal of one central radiating element of the ultrasonic diagnostic sensor reflected from the air gap in zone "a" lying behind the membrane, before activating the high-intensity focused ultrasound transducer, the value of the current signal of the same of the radiating element reflected from the patient's body, the current reflected signal is compared with the reference one, if the amplitude of the current signal reflected from the soft tissues is more than 30% of the reference one, the activation of the high-intensity focused ultrasound transducer is blocked, at the same time, the signal transit time Tmp of the same radiating element reflected from the flat membrane and the reference signal Tmc is determined, before activating the high-intensity focused ultrasound transducer, the transit time of the current signal Ta reflected from the patient's body is determined, if Ta>0.5 (Tmp + Tmc), the transducer activation of high intensity focused ultrasound is blocked.
EFFECT: prevention of damage to the ultrasonic diagnostic sensor by the radiation of the HIFU transducer reflected onto the sensor in conditions of loss of acoustic contact.
1 cl, 6 dwg
